Crystal Ball of Mind Reading

While touching the crystal ball, you can cast the
scrying spell (save DC 17) with it. You can use an
action to cast the detect thoughts spell (save DC 17)
while you are scrying with the crystal ball, targeting
creatures you can see within 30 feet of the spell's
sensor. You don't need to concentrate on this
detect thoughts to maintain it during its duration,
but ends if scrying ends.
Scrying PHB Pg. 273
Detect Thoughts PHB Pg. 231