Let $[H;G]$ be an interval of finite groups.
The rank $n$ boolean lattice $B_{n}$ is the subset lattice of $\{1,2, \dots , n\}$.
For example, for $m = p_1p_2 \dots p_n$ square free, $[1;\mathbb{Z}/m]$ is a rank $n$ boolean lattice.
The lattice $B_{3}$ is the following:
Question: Is there a rank $3$ boolean interval $[H;G]$ with $G$ simple group?
Remark: GAP has found no example for $\vert G \vert <5000$.
In $S_n$, the subgroup $S_a\times S_b$, $a+b=n$, $a\not=b$ is maximal. So taking the three maximal subgroups as stabilizers in $S_n$ of disjoint sets of different cardinalities looks like a good place to start for such configurations. Indeed, searching through alternating groups finds the following example (though it is not of this kind that motivated searching through alternating groups...):
If you take $G=A_8$ and $H=t_8n_{29}=[2^3]D(4)$ (of order 64) the condition is satisfied (as found by an explicit computation in GAP:
In case anyone cares, and to satisfy the (gap)-tag, here is the code I used for searching. It only tests for 6 intermediate subgroups, the final test of the groups then is a hand-inspection of the result of
IntermediateSubgroups.